Apparatus and a method for supplying information

ABSTRACT

An apparatus is provided with a first receiver for receiving changing information relating to a plurality of different sets of data such as financial data and a second receiver for receiving said changing information in synchronism with said first receiver means. A data base is provided to store information received by the first receiver and a subscriber profile store stores information associating a subscriber with a group of said different sets of data. The apparatus is arranged to supply, via the mobile telecommunications network, information from the data base for the group of data sets associated in the subscriber profile store with a subscriber when communication with that subscriber is first established and thereafter to supply changing information relating to the group of data sets associated with that subscriber directly to the subscriber from the second receiver.

This application is a Continuation application of Ser. No. 11/673,691filed Feb. 12, 2007, which is a Continuation application of Ser. No.09/926,751 filed Dec. 12, 2001, which is a National Stage ofPCT/R000/00008 filed Apr. 13, 2000.

BACKGROUND OF THE INVENTION 1. Field of the Invention

This invention relates to apparatus and a method for supplyinginformation. In particular, this invention relates to apparatus and amethod for supplying to a subscriber via a mobile telecommunicationsnetwork different types of information that are updated in real time,for example, information relating to financial markets.

2. Related Art

Information relating to financial markets changes rapidly throughout thetrading day to such an extent that, at busy periods or when there isparticular interest in a particular stock, option or currency, changesoccur as frequently as once a second or even more rapidly. Althoughadvances in telecommunications and, in particular, satellitetelecommunications technology enable traders to receive continuallyupdating finance and market information on desktop personal computers intheir offices over dedicated communication links, the bandwidth of thecurrent GSM standard mobile telecommunications network does not allowthe supply of real time updating information such as financial marketinformation over the mobile telecommunications network, so making itdifficult for traders and the like to keep up to date with changes inthe financial markets when away from their offices. Although changesenvisaged to the mobile telecommunications standard will increase theavailable bandwidth over the mobile telecommunications networks, thisincrease is unlikely to be sufficient to enable receipt of real timeupdating information such as financial market information over a mobiletelecommunications network.

BRIEF SUMMARY OF THE INVENTION

It is an aim of the present information to provide an apparatus andmethod for enabling a subscriber to receive via a mobiletelecommunications network information that is updated in real time suchas financial market information.

In one aspect, the present invention provides apparatus for supplying toa subscriber via a mobile telecommunications network different sets ofdata that are updated in real time, the apparatus comprising:

first receiving means for receiving said different sets of data;

second receiving means for receiving said different sets of data insynchromism with said first receiving means;

a database for storing said different sets of data received by saidfirst receiving means;

communication means for establishing communication with a subscriber viaa mobile telecommunication network;

a subscriber profile store for storing data indicating which of thedifferent sets of data a subscriber is interested in;

means for supplying initial information concerning the sets of data thata subscriber is interested in from the database when communication withthe subscriber is established; and

means for supplying information concerning the sets of data that asubscriber is interested in from said Second receiving means to thesubscriber after said initial information has been supplied.

In one aspect, the present invention provides apparatus for supplying toa subscriber via a mobile telecommunications network changinginformation for each of a plurality of different sets of data, theapparatus comprising:

first receiving means for receiving said changing information;

second receiving means for receiving said changing information insynchronism with said first receiving means;

a database for storing information received by the first receiving meansrelating to said different sets of data;

communication means for establishing communication with a portablecomputer of a subscriber via a mobile telecommunications network;

a subscriber profile store for storing information associating asubscriber with a group of said different sets of data;

means for supplying to a subscriber's portable computer via the mobiletelecommunications network information from the database for the groupof data sets associated with that subscriber when communication withthat subscriber's portable computer is established; and

means for supplying from said second receiving means to the subscriber'sportable computer changing information relating to the group of datasets associated with that subscriber in the subscriber profile storeonce said initial information has been supplied to the subscriber.

In an embodiment, the present invention provides apparatus that enablesa subscriber to receive via a mobile telecommunications network initialdata for initialising the presentation on a display of the subscriber'sportable computer of information relating to different sets of data suchas financial market data and then, once the initialisation procedure hasbeen completed, supplies only changes to that group of data to theportable computer over the mobile telecommunications network so that,once the initialisation has been completed, the only data that needs tobe supplied over the mobile telecommunications data is data that haschanged since the initialisation procedure. This reduces the amount ofdata that has to be supplied to the subscriber and so facilitates supplyof continually changing data such as financial market data virtually inreal time over a mobile telecommunications network.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S)

Embodiments of the present invention will now be described, by way ofexample, with reference to the accompanying drawings, in which:

FIG. 1 shows a diagrammatic representation of a system embodying thepresent invention for supplying to a subscriber via a mobiletelecommunications network, different sets of changing or continuallyupdating data;

FIG. 2 shows a block diagram illustrating functional components of aservice provider shown in FIG. 1;

FIG. 3 shows a block diagram illustrating functional components of ademand engine server of the service provider shown in FIG. 2;

FIG. 4 shows a block diagram illustrating functional components of anadministration section of the service provider shown in FIG. 2;

FIG. 5 shows a block diagram illustrating functional components of theclient interface of the demand engine server shown in FIG. 3;

FIG. 6 shows a block diagram illustrating functional components of asubscriber's portable computer;

FIGS. 7a and 7b show basic elements of a data structure for sets of datasupplied to the service provider shown in FIG. 1 with FIGS. 7a and 7brepresenting price information and news information respectively;

FIG. 8 shows different data stores of a database of the service providershown in FIG. 2;

FIGS. 9 and 10 are diagrams for explaining a packet filter of the demandengine server shown in FIG. 3;

FIG. 11 shows a flow chart illustrating steps carried out by asubscriber's portable computer to receive data from the serviceprovider;

FIG. 12 shows a top level flow chart illustrating steps carried out bythe service provider during supply of data to a subscriber;

FIGS. 13 and 14 show flow charts for illustrating processing of datareceived by the service provider shown in FIG. 2 from the informationprovider shown in FIG. 1;

FIGS. 15a and 15b show steps carried out by the parser shown in FIG. 2or the parser shown in FIG. 3 for price and news informationrespectively;

FIG. 16 shows further steps carried out by the parser shown in FIG. 2 tostore data in the database;

FIG. 17 shows steps carried out by the demand engine server shown inFIG. 2 to determine the subscriber(s) to which data should be supplied;

FIG. 18 shows a flow chart illustrating steps carried out in the supplyof data to a subscriber;

FIG. 19 shows diagrammatically a main menu displayed on a subscriber'sportable computer display prior to the subscriber communicating with theservice provider to start a session during which the subscriber will besupplied with data by the service provider;

FIGS. 20 to 25 show screens that may be displayed to a subscriber ontheir portable computer to enable creation of a subscriber profileidentifying the group of sets of data that the subscriber wishes toreceive from the service provider;

FIG. 26 shows a diagram illustrating the exchange of information betweenthe service provider and the subscriber during a session; and

FIGS. 27 to 35 show typical examples of how data supplied by apparatusembodying the invention is displayed on the display of a subscriber'sportable computer.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 shows a diagrammatic representation of a system 1 for supplyingcontinually updating or changing information for sets of data to aplurality of subscribers.

In this system 1, an information provider 2 provides continuallyupdating information regarding a plurality of sets of data to a serviceprovider 4 via a satellite 3 communications link. The service provider 4provides continually updating information for specific ones of the setsof data of interest to a subscriber to each of a plurality ofsubscribers 5 a, 5 b, 5 c, and 5 d via a GSM mobile telecommunicationsnetwork 6.

In the embodiments to be described below, the information provider 2provides continually updating data relating to financial tradingmarkets, in particular commodities (futures and options), stocks,indices and foreign exchanges and news. The information provider 2 maybe, for example, Standard and Poor's ComStock XpressFeed that providesaccess to real time prices for futures and options exchanges, stockexchanges, index exchanges and Forex (foreign exchange) and also acts asto supply real time financial news. The specific financial market,exchanges and news services for which real time data is provided isdetermined by the information provider 2. It will, of course, beappreciated that information providers 2, other than Standard and Poor'sComStock XpressFeed, may be used for example, information providers suchas Bloomberg and Reuters.

FIG. 2 shows a functional block diagram of the service provider 4. Theservice provider 4 consists of information receiving apparatus 6 thatreceives information via the satellite link 3 from the informationprovider 2 and information supplying apparatus 7 that is configured tosupply continually updating information to subscribers over the GSMnetwork 6.

The information receiving apparatus 6 consists of two client siteprocessors CSP1 and CSP2 provided by Standard and Poor. The client siteprocessors CSP1 and CSP2 are each coupled via a communications link 6 ato a satellite dish SD to enable both client site processors CSP1 andCSP2 to receive an encrypted data stream over the satellite network 3from the information provider 2.

Each of the client site processors CSP1 and CSP2 is arranged to decryptand demodulate the received encrypted data stream and to maintain alocal database of the financial data provided via the satellite network3 by the information provider 2.

Each of the client site processors CSP1 and CSP2 allows a single clientconnection 6 b and 6 c using the TCP/IP protocol so that a clientconnected to the client site processor can receive via the TCP/IPconnection real time updating financial data provided by the informationprovider 2 via the satellite 3 link.

The actual financial markets, exchanges and news services for which realtime updating data can be obtained by the client via the TCP/IPconnection to the client site processor will be determined by theconfiguration of the client site processor which will itself bedetermined by the contractual arrangement between the service provider 4and the information provider 2.

The arrangement described so far differs from a conventional arrangementwhere the information provider 2 is providing real time updatingfinancial data via a client site processor to a desktop personalcomputer or a network of desktop personal computers each of which canreceive and display the real time updating financial data because twoclient site processors CSP1 and CSP2 are provided which are identicallyconfigured and which are coupled via a single communications link 6 a tothe satellite receiving dish SD. The two client site processors CSP1 andCSP2 thus receive and supply the real time updating data in a stream ofpackets in synchronism with one another to their respective TCP/IPconnections 6 b and 6 c.

The subscriber information supplying apparatus 7 comprises a demandengine server 8 connector via the first TCP/IP connection 6 b to theclient site processor CSP1 and a parser 9 connected via the secondTCP/IP connection 6 c to the client site processor CSP2. As will bedescribed in detail below the demand engine server 8 is arranged tosupply data received over the TCP/IP connection 6 b to subscribers via aGSM network 6 (FIG. 1) while the parser 9 is arranged to cause datareceived over the TCP/IP connection 6 c to be stored in a database 10 ofthe subscriber information supplying apparatus 7.

The subscriber information supplying apparatus 7 also includes anadministration unit 11 for enabling a systems operator to have access tothe subscriber information supplying apparatus 7 to allow, for example,configuration of the database 10 as will be described below.

The block diagram shown in FIG. 2 is intended only to illustrate thefunctions carried out by the service provider 4. In practice thesubscriber information supplying apparatus 7 may consist of amultiprocessor distributed processing system using Windows NT version4.0 or higher operating system, Microsoft SQL server version 7.0 andMicrosoft Access 97 or other database software. Typically, themultiprocessor system will consist of four processors and the functionsillustrated by the blocks shown in FIG. 2 will be distributed amongstthe processors of the multiprocessor system in conventional manner.

FIG. 3 shows a functional block diagram of the demand engine server 8.The demand engine server 8 consists of a parser 12, a thread pool 13, apacket filter or subscriber profile store 14 and subscriber and databaseinterfaces 15 and 16.

As will be described in greater below, when a subscriber initiallyestablishes communication with the service provider 4 over the GSMnetwork 6, the demand engine server 8 allocates to that subscriber athread 13 which is part of the subscriber interface 15 that accesses viathe database interface 16 the data stored in the database 10 in respectof the sets of data in which the subscriber is interested and causesthat accessed data to be communicated to the subscriber over the GSMnetwork 6 so as to provide the subscriber with initial values for thesets of data in which the subscriber is interested. The subscriberinterface 15 also causes the packet filter or client profile store 14 tostore data associating the subscriber with the sets of data in which thesubscriber is interested. The parser 12 is arranged to extract data fromthe data stream provided via the TCP/IP connection 6 c, to determinefrom the packet filter 14 which of the connected subscribers areinterested in the extracted data and to release the associatedsubscriber threads to supply that data to the interested subscribers viathe subscriber's interface 15 and the GSM network 6.

The administration unit 11 is provided to enable a systems operator orlike personnel to configure or update the database 10. Typically, theadministration unit 11 consists of processing capability which may beprovided by the multiprocessor distributed processing system describedabove or may be provided by a dedicated processor.

FIG. 4 shows a computer system that, when programmed, provides computerapparatus having the functionality of the information supplyingapparatus 7 shown in FIG. 2. As shown, a processor unit 17 (which may bea multi-processor unit) is associated with a display 18 for displayinginformation to a systems operator or other user, a user input device 19consisting of a keyboard and, typically, also a pointing device such asa mouse, a removable media storage 20 for receiving a removable medium(RM) 21 such as a floppy disk, CDROM or DVD disk and mass storage memory22 which may, for example, be a hard disk drive arrangement or anallocated part of the memory associated the multiprocessor distributingprocessing system. The computer system may also have a communicationsinterface 19 a, for example a network card, enabling communication withother processors or computers on the same network or over an Intranet orthe Internet.

The subscriber interface 15 provides, as shown in FIG. 5, a datastructure 23 for storing data carried on a subscriber thread if theassociated subscriber is not able to receive that data and a subscribercommunications interface 24 for dealing with communication over the GSMnetwork 6 with subscribers using conventional Windows sockets.

In order to receive data from the service provider 4, each of thesubscribers 5 must have a computer provided with GSM mobiletelecommunications capabilities. Although the computer could, forexample, be a portable notebook or laptop computer having mobiletelecommunications capabilities, in this embodiment the computercomprises a palm top computer designed to operate under the Windows CEversion 2.0 or higher operating system and provided with both a GSM cardand a touch sensitive display or screen. Typically, the palm topcomputer may be the HP680 Jornada palm top computer supplied by HewlettPackard although other palm tops of similar specification may be used.

FIG. 6 shows a block diagram for illustrating the basic functionalcomponents of a subscriber's portable computer 30. As shown the portablecomputer comprises a processor unit 31 with associated memory 32, a GSMcard 33, a removable media storage 34 for receiving a removable storagemedium 35 such as a flash RAM card and a display 36 which also providesa touch sensitive screen for enabling user input. The portable computer30 will generally also include a further user input device 37 in theform of a keyboard.

Program instructions and/or data for configuring the components of thesubscriber information supplying apparatus 7 may be input using the userinput device 19, supplied on a removable data storage medium 21 orsupplied as a signal over the communications interface 19 a or by anycombination of these. Similarly, program instructions and/or data forconfiguring the subscriber's portable computer 30 may be supplied as asignal via the GSM card 33 or another communications interface (notshown), input via the user input device 37 or supplied on a removablestorage medium 35 or by any combination of these.

The data stream provided via the TCP/IP connections 6 b and 6 c consistsof packets of data provided either in a generic format in which thepackets consist of a fixed number of fields delimited by “{” or in adigital form in which the packet have a variable number of fields withthe fields being indicated by batecodes.

Data relating to a particular trading market or exchange contract issupplied in a single packet which has the basic format shown in FIG. 7a. Thus the packet consists of an exchange identification code 40consisting of two to three characters, a symbol identification code 41identifying the particular contract on the exchange and data fields 42carrying the current price data for that contract. The contracts may becommodities (futures and options), stocks, indices or FOREX (foreignexchange). Where the symbol ID represents a future commodity then thesymbol ID will include an expiry date while where the symbol IDrepresents an option commodity, then the symbol ID will include anexpiry date and a strike price. To take an example, the exchange ID “17f” may represent the LIFFE (London Independent Financial FuturesExchange). Where this is followed by the symbol ID “Zmy” this mayindicate the FTSE 100 with an expiry date of “my”, where “m” representsthe month and “y” represents the year of the expiry date. Where thecontract is an options contract, then the symbol ID will have the format“Amysss” where “A” indicates the identity of the contract, “my”indicates the expiry date and the “sss” indicates the strike price. Fora futures contract, then the price data field will include real timeprices such as, for example, “ASK”, “BID”, “CLOSE” etc., prices.

The information provided by the information provider 2 need not besimply financial data but may include finance related news data. Asingle news item may span more than one packet. FIG. 7b shows a datastructure for a news packet. As shown a packet for a news message willcontain at least a header (“head code”) 43 identifying the news item andthe section within the news item plus a news body 44 contains at least aportion of the text from the news item. The packets need to identifywhich section of the news item is carried by the packet because thepackets need not necessarily be transmitted in order.

FIG. 8 illustrates the main data stores of the database 10. These datastores include a customers data store 50, a subscribers data store 51,an exchanges data store 52, a subscriber entitlement data store 53, asymbols data store 54 and a data data store 55. Although not shown inFIG. 8, the database 10 will also include other data stores, for exampledata stores for storing data for accounting purposes including data forenabling billing of customers and data for determining the fees payableby the subscribers to the service provider 4.

The customers data store 50 includes a file for each of the customers ofthe service provider 4. Each customer file includes fields for acustomer ID, the customers name and address and the number ofsubscribers that can be allocated to that customer.

Each customer file is related by its customer ID to one or moresubscriber files in the subscriber data store 51. Each subscriber fileincludes fields for a subscriber ID, the customer ID, a subscriber nameand a subscriber password. Each subscriber file may also contain furtherinformation regarding the status of a subscriber.

Each subscriber file in the subscriber data store 51 is related to asubscriber entitlements file in the subscriber entitlements data store53 by its subscriber ID. Each file in the subscriber entitlements datastore contains fields for the subscriber ID, the exchange IDs of theexchanges for which the subscriber is entitled receive data, the startand end date of the subscriber's entitlement and whether or not thesubscriber's entitlement has been revoked.

Each subscriber entitlement file is related by the exchange IDs to oneor more files in the exchanges data store 52. Each exchange filecontains the exchange ID, the exchange name, the exchange type, that iswhether the exchange is a commodities (future and options), stocks orindices exchange or a currency exchange (forex), together with dataindicating the availability of the exchange.

The database 10 also includes a symbols data store 54 which contains aplurality of symbols files each of which associates a particular patternwith a corresponding exchange ID, the name of the company with which thecontract is associated and the symbol type, where the symbol typeidentifies the type of the exchange, for example futures, options,index, stock, FOREX. Each pattern is related to a plurality of symbolsprovided by the information provider. Thus, for a futures and optionscontract where symbol is HBU9 (where HB represents the contract namewhile U9 represents an expiry date of September 1999) then thecorresponding pattern will be HBmy where m and y are fields for expirymonth and year and may represent any month and year. As will beappreciated all symbols for the contract name “HB”, regardless of theirexpiry date, will be associated with the same pattern. The informationstored in the symbols file is provided by or derived from theinformation provider 2 and enables the subscriber information supplyingapparatus 7 to identify the contract to which a packet of data relatesand to supply the data to the interested subscribers in a format orprotocol defined by the service provider 4 for transmission of data tothe subscribers over the GSM network 6.

Each customer file may be associated with more than one subscriber fileenabling, for example, a company to be responsible for the payment forthe usage of the system by a number of its employees, each of whom hashis own individual subscriber file.

The data stored in the data stores 50 to 54 is static information thatis input to the database 10 by a systems operator using theadministration unit 11. The data in the exchanges and symbols datastores 52 and 54 is determined by information provided by theinformation provider 2 while the data in the data stores 50, 51 and 53is partly supplied by the customers and subscribers and partlydetermined by the service provider 4.

The data data store 55 is provided to store data received via the TCP/IPconnection 6 c and parsed by the parser 9. The data store 55 thus storesthe relevant data for each contract for which information is provided bythe information provider 2.

Each financial exchange contract has its own data file identified by thecorresponding symbol and exchange ID. The information in each data fileis updated each time updated information is received for thecorresponding contract from the information provider 2, as and when theprice data changes. FIG. 8 shows typical price data fields. Any one ormore of the price data fields for a contract may be updated at any onetime. When updated information for a price data field is received, thenthe data already in that field in the relevant data file is replaced sothat the data store stores only the most recently received data for eachcontract.

FIGS. 9 and 10 are diagrams for explaining the structure of the packetfilter or profile store 14. In this embodiment, the packet filter has aternary tree structure. Each exchange ID EX1, EX2, EXn stored in thedatabase 10 is associated with a corresponding ternary tree structureT1, T2 . . . Tn as shown in FIG. 9. FIG. 10 shows a ternary treestructure Tx consisting of a hierarchical arrangement of nodes with afirst or uppermost level having a single node No connected to threenodes N₁₁, N₁₂, N₁₃, of the second level of the hierarchy. Each nodeN₁₁, N₁₂, N₁₃ of the second level is connected to a respective set ofthree nodes in the third or next lower level.

Although, for simplicity, FIG. 10 shows only the nodes N₁₁₁, N₁₁₂, N₁₁₃of the third level that are connected to the node N₁₁ of the secondlevel it will be appreciated that the nodes N₁₂ and N₁₃ will also becoupled to three nodes in the third level. Although only three levelsare shown, a ternary tree structure may consist of four or more levels,depending upon the data to be stored in the ternary tree.

The ternary tree associated with an exchange is used to store thealphanumeric patterns for the contracts on that exchange. Each node isassociated with one alphanumeric character that may appear in thepattern. Each final or terminal node in the tree is associated with aparticular pattern, for example the pattern “HBmy” identifies thefinancial contract “HB” and the fields “my” identify, for example, themonth and year of expiry. Each pattern HBmy will be associated withcontracts having the name HB and different expiry dates, that is eachpattern will be associated with one or more symbols, for example onesymbol may be “HBU9” representing a contract of name “HB” expiring inSeptember 1999.

As noted above, each node is connected to three nodes in the next levelin the hierarchy with the left hand connected node being associated witha character that is lower in the alphanumeric order and the right-handnode being associated with a character that is higher in thealphanumeric order. This is indicated in FIG. 10 by the “<” and “>”symbol, respectively.

The intermediate node represents the route that is followed by a searchthrough the ternary tree structure when the character being searched foris the same as the character associated with the connected node in theprevious level (represented by the “=” symbol). Thus, for example, wherethe stored patterns have the form “HBmy” where “HB” is an alphanumericcharacter representing the name of the contract and “m” and “y” arealphanumeric characters representing the month and year of expiry of thecontract, then if, for example, the symbol is “HU9” where the characters“U9” represents September 1999 and the node No is associated with thecharacter I, then a search for the symbol “HU9” will initially followthe left-hand branch of the tree structure because H is less than I inthe alphanumeric order and then, when node N₁₁ is reached, the searchwill follow the intermediate branch to node N₁₁₂ because the characterassociated with the node N₁₁ will be H. When the node N₁₁₂ is reached,then the character associated with node N₁₁₂ is checked and theappropriate one of the three branches (not shown) connected to that nodeis followed, depending on whether that character is less than, greaterthan or equal to the next character B in the pattern and so on until afinal node is reached that is associated with the pattern “HBmy”.

Each such final node in the ternary tree is associated by the demandengine server 8 with the threads for the subscribers submitting profilesindicating in contracts having that pattern and particular expiry datesso that a search by the demand engine server through the ternary treestructure associated with a particular exchange will enable the demandengine server to identify the subscribers interested in a contracthaving a particular pattern and a sequential search can then beconducted to identify the subscribers interested in a particular expirydate identified by a received symbol.

The packet filter therefore effectively provides a client or subscriberprofile store that associates each subscriber with the contract orcontracts in which that subscriber is interested. A similar ternary treestructure may be provided for news items so that a subscriber need notnecessarily receive all news items but may elect to receive news itemsonly from a particular group of financial news suppliers.

The use of ternary tree structures enables efficient and rapid searchingto determine the subscribers associated with, that is interested in, acontract associated with a particular pattern. It will, however, beunderstood that other storage and searching arrangements may be used,for example, hash tables which sprinkle the alphanumeric stringsthroughout an array or binary search trees which store the strings inorder may be used. However, ternary tree structures provide the mostefficient and therefore quickest way of searching for pattern orcharacter strings of the type referred to above.

The operation of the system described above with reference to FIGS. 1 to10 will now be described with reference to FIGS. 11 to 38.

The database 10 shown in FIG. 8 is assumed to have been populated byinitial data supplied by the information provider 2 so that theexchanges data store 52 is populated by information identifying theexchanges for which the information provider 2 provides information andso that the symbols data store 54 has been populated by informationassociating each contract available on each exchange with thecorresponding exchange ID and identifying the pattern and symbol used toidentify that contract.

It will, of course, be appreciated that the exchanges and contracts forwhich the information provider 2 provides information to the serviceprovider 4 may change from time to time in accordance with changes onthe financial market and also changes in the contractual agreementbetween the service provider 4 and the information provider 2. Any suchchanges to the information stored in the exchanges and symbols datastores 52 and 54 will be provided to the service provider 4 via theinformation provider 2 so that a systems operator can update theexchanges and symbols data stores 52 and 54 using the administrationunit 11.

Similarly, the customers, subscribers and subscribers entitlements datastores 50, 51 and 53 will be populated with information input by asystems operator using the administration unit 11 in accordance withdata supplied to the service provider 4 by the customers and thecontractual agreement between each customer and the service provider 4.In addition, the accounting data stores which are not shown in FIG. 10will similarly be populated by initial information provided by theinformation provider 2 and the customers to the service provider 4. Thisinformation may, of course, be updated by the service provider 4 toallow for addition of customers and subscribers and for changes in thecontractual relationship between the customers and the service provider.

Referring now to FIGS. 11 and 12, assuming that a subscriber's detailshave already been stored in the database 10 and the subscriber has beenallocated a password or authentication code, then in order to log on toor start a session with the service provider 4, the subscriber 5 mustfirst establish communication with the service provider 4 over the GSMnetwork 6 (step S1 in FIG. 11). Then the subscriber enters his user nameand authentication code or password into his portable computer 30 andthe portable computer sends the information to the service provider 4over the GSM network 6 at step S2.

The portable computer 30 then waits for the subscriber to enter profiledata identifying the exchanges, contracts and filtering information (forexample expiry date and strike price for a futures and options contract)in which the subscriber is interested in receiving information and thensends that profile data over the GSM network 6 to the service provider 4(step S3). The portable computer 30 then waits for the requested data tobe sent by the service provider 4 over the GSM network and, when thedata is received, displays that data on its display 36 at step S4. Theportable computer 30 continues to receive data from the service provider4 over the GSM network 6 and to update the data displayed to the useruntil the portable computer 30 determines at step S5 that the subscriberwishes to log off.

FIG. 12 shows the steps carried out by the service provider 4 duringcommunication with a subscriber. It will be appreciated that, becauseeach subscriber or client is allocated its own thread by the demandengine server 8, the service provider 4 can communicate simultaneouslywith a number of different subscribers even though each of thesubscribers may be receiving different information.

At step S6 in FIG. 12, the demand engine server 8 waits for requests forcommunication from a subscriber's portable computer and, when such arequest is received, establishes communication with that subscriber(step S6). At step S7, the demand engine server receives the user nameand authentication code or password supplied by the subscriber and atstep S8 checks the subscribers data store 51 to determine whether thereceived password is a valid password and, if so, whether the subscriberID that is automatically sent by the subscriber's portable computer whenthe subscriber attempts to log on agrees with the subscriber ID storedin the subscriber's data store 51 for that password (step S8). If thepassword is invalid or does not agree with the subscriber ID, then thedemand engine server 8 communicates with the subscriber at step S9 andcauses the subscriber's portable computer to display to the user amessage indicating that, for example, the password is invalid. The usermay then re-attempt communication by re-entering the password.

Once the subscriber has been authenticated, then the demand engineserver 8 checks to see whether the database 10 contains any informationregarding modifications by the information provider 2 to the exchangesand contracts available and if so communicates that information to thesubscriber's portable computer at step S10 so as to enable the list ofavailable exchanges and contracts stored in the memory 32 of thesubscriber's portable computer to be updated.

At step S11, the demand engine server 8 receives from the subscriber'sportable computer the subscriber profile data provided by the user andthen updates the packet filter 14 so as to associate that subscriber andthe filtering information (eg expiry date(s) included in the profiledata with the nodes in the packet filter ternary tree structure for thepatterns representing the contracts in which the subscriber isinterested at step S11.

The demand engine server then accesses the data data store 55 in thedatabase 10 and supplies to the user initial data from the database 10for each of the contracts identified in the received subscriber'sprofile. This data will represent the data most recently received fromthe information provider 2 and stored in the data data store 55 because,as noted above, the information in the data data store 55 is continuallyupdated as and when updated information is received from the informationprovider 2.

Once the subscriber's portable computer has been initialised with thedata supplied from the data data store 55 (step S12 in FIG. 12), thenthe demand engine server 8 will supply to that subscriber's portablecomputer 30 updated information received via the TCP/IP connection 6 bfor any of the contracts identified in the subscriber's profile (stepS13 in FIG. 13) until the demand engine server 8 determines at step S14in FIG. 12 that the subscriber has logged off, that is the subscriberhas ended the session.

As will be evident from the following explanation, a subscriber maysubscribe with different profile data in different Windows. Where thisis the case, then the subscriber will be sent the data corresponding tothe subscribed profile to be displayed in the corresponding Window untilthe subscriber closes that particular Window or logs off.

The processing of data received by the subscriber information supplyingapparatus 7 from the clients site processors CSP1 and CSP2 over theTCP/IP connections 6 b and 6 c will now be described in greater detailwith reference to FIGS. 13 to 18.

FIG. 13 shows a flow chart illustrating the basic operations carried outby the parser 9. As noted above, the parser 9 is continually receiving,over the TCP/IP connection 6 c, packets of data from the client siteprocessor CSP2. Typically, the data stream may consist of between 100and 500 packets per second, depending upon the amount of activity on thefinancial markets, with each packet containing the price data that haschanged for a particular contract. In this example, each packet containsup to 300 bytes.

As the data stream of packets is received by the parser 9 from theclient site processor CSP2 at step S15, the parser 9 extracts thepackets from the data stream and parses (step S16) the packets so as todetermine the exchange ID and symbol (which also determines the relevantpattern) to enable the data to be stored in the relevant data file inthe data data store 55 (step S17). The parser 9 carries out steps S16and S17 continually so that the data stored in the database 10 isupdated as and when updated price data for a contract is received fromthe information provider 2 via the client site processor CSP2.

FIG. 14 shows a flow chart for illustrating the processing by the demandengine server 8 of the data stream received from the client siteprocessor CSP1 via the TCP/IP connection 6 b. The parser 12 of thedemand engine server 8 continually receives, extracts and parses packetsof data received from the client site processor CSP1 (steps S18 and S19in FIG. 14). The operations carried out by the parser 12 at steps S18and S19 correspond to the operations carried out by the parser 9 atsteps S15 and S16. The operation of the demand engine server 8 differsfrom that of the parser 9 in that, once a packet has been parsed, thedemand engine server 8 conducts a search through the ternary treestructures of the packet filter 14 to identify the node associated withthe pattern for that packet and then determines which, if any, of theconnected subscribers associated with that node have submitted a profilematching the symbol for the contract update information received in thatpacket (step S20). The demand engine server then releases at step S21the subscriber threads associated with the identified node and matchedprofile so as to enable the contract update data to be supplied to thesubscriber or subscribers identified from the packet filter (step S21).

FIG. 15a shows in greater detail the parsing of a financial contractdata packet (step S16 in FIG. 13 or step S19 in FIG. 12). Thus, at stepS29, the parser 9 or 12 identifies the exchange code in the extractedpacket and then, at step S30, identifies the symbol ID or symbology andat step S31 extracts the price data fields.

FIG. 15b shows a flow chart illustrating parsing of a news data packet.Thus, at step S29 a the parser 12 identifies the new code of theheadline and at step S30 a identifies the news body and at step S31 aextracts the news data fields.

FIG. 16 illustrates in greater detail the step S17 carried out by theparser 9. Thus, at step S32, having identified the exchange ID andsymbol ID, the parser 9 accesses the area of the data data storeassociated with the exchange and symbol ID carried by the extractedpacket and then, at step S33, uses the price data code accompanying theprice data in the packet to determine which price data fields for thatcontract are being updated and then stores the updated price data in therelevant field for that contract (step S33).

FIG. 17 shows step S20 of FIG. 14 in greater detail. Thus, once theparser 12 has parsed an extracted packet identifying the exchange ID andsymbol ID or pattern, then the demand engine server 8 accesses thepacket filter 14 at step S34 and then, at step S35, conducts a searchthrough the ternary tree structure associated with the identifiedexchange ID as described above until the node associated with thepattern for the identified symbol is reached (step S35). The demandengine server then determines (step S36) the subscriber threadsassociated with the located or identified node and matched profile andreleases the thread carrying the update data to the subscriber interface15.

FIG. 18 illustrates further steps in the communication of data with asubscriber. As will be appreciated, the subscriber information supplyingapparatus 7 constitutes a multiprocessor system that is considerablymore powerful than the subscriber's portable computer. This means thatthe subscriber information supplying apparatus 7 is potentially capableof supplying data at a faster rate than can be handled by thesubscriber's portable computer so that, for example, the subscriber'sportable computer may still be processing the last received set of datafor display on the display 36 when the subscriber information supplyingapparatus 7 wishes to send further update data. Accordingly, as shown inFIG. 18, before supplying update data to a subscriber, the demand engineserver 8 checks at step S37 whether the subscriber is ready or availableto receive data.

If the answer at step S37 is no, then the demand engine server 8 storesthe update data in the data structure 23 for that subscriber (step S38)until the answer at step S37 is yes, the subscriber is able to receiveupdate data. If further update data is received before the subscriber isready or able to receive data, then the data stored in the subscriberdata structure 23 at step S38 is replaced by that updated data. Thisensures that, despite any processing limitations of the subscriber'sportable computer, the subscriber receives the most up-to-date pricedata possible.

When the answer at step S37 is yes, then the update data is supplied tothe subscriber's portable computer via the subscriber interface 24 andthe GSM network 6 using the GSM protocol. Although the current GSMstandard provides a bandwidth of only 9600 bps, subscribers can stillreceive financial data in virtually real time because, once thesubscriber's portable computer has been initialised with data taken fromthe database 10, the only data that needs to be sent to the subscriber'sportable computer over the GSM network 6 is the data that has changedfor the specific contracts in which the subscriber is interested. Thismeans that the amount of data that must be supplied to the subscriberover the GSM network to keep the subscriber up-to-date is considerablysmaller than the amount of data received by the subscriber informationsupplying apparatus 7 from either client site processor CSP1 or CSP2.This allows the subscribers to receive continually updating financialdata over the GSM network which, because of the relatively limitedbandwidth of the GSM network, would not be possible if the informationwas being supplied directly from the information provider 2.

The system described above will now be further explained by way ofreference to examples of screens displayed to the user on the display36. As noted above, the subscriber's portable computer will generally bea palm top running the windows CE operating system which, as is wellknown in the art, enables a user to launch an application once thecomputer has been powered up by either clicking on an icon associatedwith that application or by selecting the application from the startmenu. Once this has been done, then the processor unit 31 displays tothe user a display screen requesting the user to insert their user nameand password and once the user name and password has been verified asdescribed above, the processor unit 31 displays to the user the mainscreen 70 shown in FIG. 19 which includes a start button 71 for enablingpowering down of the computer and access to other applications and anumber, five as shown, of main menus buttons. In this example, the mainmenus consist of “prices”, “news”, “create profiles”, “use profiles” and“utilities”. The utilities main menu is, in this example, providedsimply to enable the user to change their password and will not bedescribed in greater detail herein.

The “prices” main menu is provided to enable a user to create profilesfor either immediate use or storage in the memory of the portablecomputer 30 for later use while the “news” menu enables a user torequest receipt of financial news data from the service provider 4. The“create profiles” main menu enables a user to create profiles forstorage on the portable computer for future use while the “use profiles”main menu enables the user to access a previously stored profile andsubmit that to the service provider.

The “prices” main menu when selected offers the options of creating astandard futures and options profile, an index profile, a FOREX (foreignexchange) profile and a stock profile. FIG. 20 shows the screen 72displayed when futures and option is selected from the prices main menuwhile FIGS. 21, 22 and 23 show, respectively, the screens 81, 85 and 90displayed when index, FOREX (foreign exchange) and stock, respectively,are selected from the prices main menu.

The futures and options display 72 shown in FIG. 20 has a window 73 fordisplaying the list available exchanges stored in the memory 32, awindow 74 for displaying available contracts stored in the memory 32 forthe exchange shown in the window 73, a window 75 for enabling a user tospecify an expiry date for contracts, a window 76 for enabling a user tosave an exchange and contract selection, a search window 77 for enablinga user to enter, for example, the first four characters of a contract toenable a user to search for a particular contract from the list storedin the memory 32 of his portable computer. The screen 72 also provides acomposite window 78 which, when the user clicks in the composite window,selects a display option for contract data in which contract data forcontracts of the same type (that is for example all futures and optionscontracts) to be displayed in the same window on the display 36. Each ofthe windows 73 and 74 is associated, as is well known with the windowsCE operating system, with a downwards arrow that enables the completelist of exchange names and contract names stored in the memory 32 of theportable computer 30 to be displayed to the user so as to enable theuser to select a particular exchange and contract by clicking on thatexchange and contract.

Once the user has confirmed that the required exchange and contract aredisplayed in the windows 73 and 74, the user clicks on an apply button79 to add the selected contract to his futures features and optionsprofile. The user may then repeat the above process. Each time the applybutton 79 is clicked the displayed exchange and contract will be addedto the user's futures and options profile. If the user has allocated aname or mnemonic to the profile in the window 76 then the profile willbe stored in the memory 32 so that it can be retrieved and used forfuture sessions after the present session has ended. Otherwise, theprofile is stored in the memory 32 only for the duration of the currentsession. Once the user is happy with the selection of exchanges andcontracts and wishes to start a session, then the user clicks on asubmit button 80. The processor unit 31 then reads the data stored inthe memory 32 for the created profile and supplies that to the demandengine server 8 over the GSM network 6 using the protocol determined bythe software installed on the portable computer so as to enable theservice provider 4 to identify the exchanges and contracts required bythe subscriber and to store this information in the packet filter 14 asdescribed above.

FIG. 21 shows the screen 81 displayed to the user when the user selectsthe “index” option from the prices menu. Again this has a window 82 fordisplaying available indices. This window may, as is well known in theart, display a single line in a manner similar to that shown for window73 in FIG. 20 or may be expanded as shown in FIG. 21 to enable a user toscroll through the list of indices stored in the memory 32. This windowis also associated with a search criteria window 83 to enable a user toselect a particular index by entering, for example, the first four ormore characters of the index name and, again, the user can optionallyallocate a name or mnemonic to the profile so that the profile can besaved in the memory 32 for use in subsequent sessions after the currentsession has ended. In this example, once the user is satisfied withtheir index selection, then the user clicks on a submit button 80 a atwhich point the processor unit 31 reads the data input by the user andsubmits the profile to the service provider 4 over the GSM network 6 inaccordance with the predetermined protocol with the service provider 4.

FIG. 22 shows the screen 85 displayed when the user selects the ‘FOREX’option. As shown there is a currency display window 86, a box 87 toselect all currencies, a window 88 to select the cross currency to whichthe exchange rate is referenced, a terms window 89 to enable a user toselect the types of price data he wishes to receive, a profile savingwindow 76 b and a ‘submit’ button 80 b as before.

FIG. 23 shows the screen 90 displayed when the user selects the LondonStock Exchange from stock options under the prices menu. This screenprovides a window 91 for displaying to the user the list of stock namesstored in the memory 32, a search criterion window 92 for enabling auser to input characters in part of a stock name to enable that stockname to be retrieved from the stored list, a window 76 c for enabling auser to allocate a name or mnemonic to the stock profile so that it isstored in the memory 32 for retrieval for future sessions and a submitbutton 80 c for enabling submission of the profile to the serviceprovider 4 in a manner similar to that described above for the futuresand options, indices and FOREX profiles.

Each of the above described windows also has a cancel button 100 forenabling cancelling of a profile where the user finds they have made amistake.

In this embodiment, the user may also create a futures and optionsprofile using the “create profiles” main menu. FIG. 24 shows the screen93 displayed to the user when this option is selected. As can be seenfrom a comparison with the screen 72 shown in FIG. 20, this screenprovides a user with more options than the standard futures and optionsprofile. In particular, the screen 93 enables a user to set a strikeprice in a strike price window 94 and to define the list of price datafields in which the user is interested in a fields window 96. In thiscase, each time a price data field is selected the user clicks on theapply button 79 to add that to the profile. Again, as in the case of thestandard futures and options profile, the user can click in thecomposite window 78 to select the composite option to enable price datafor different contracts to be displayed in the same window.

As described above, each time the user clicks on the submit button, theprofile defined by the user is transmitted over the GSM network 6 to theservice provider 4 and the packet filter 14 of the demand engine serveris updated so as to associate the relevant nodes in the packet filterswith that subscriber. The subscriber may submit only a single profile ormay submit a number of different profiles for the same session eachhaving a separate window. (If a subscriber closes a window, then thesubscriber will no longer receive data for the profile defined by thatwindow).

In the present arrangement, the system is configured such that a profilecannot be modified during a session unless the profile is a futures andoptions profile for which the composite option has been selected. Wherethe composite option has been selected, then the user may modify thecomposite profile during a session by acting upon, in thisdouble-clicking on, the corresponding output screen. When this is done,then the processor unit displays to the user the screen 97 shown in FIG.25 which has a first window 98 displaying the current contracts selectedfor the composite profile and windows 73 a, 74 a, 77 a and 75 acorresponding to windows 73, 74, 75 and 77 shown in FIG. 20 to enablefurther exchanges and contracts and expiry dates to be selected by auser and added to the profile by clicking on the “new” button 99. Anexisting contract may be deleted from the profile by selecting thecontract and clicking on the “delete” button 99 a. An existing contractmay be modified by highlighting the contract, changing the profile data(for example the expiry data) and then clicking on the apply button 79.Again, if a name or mnemonic has been allocated in the window 76 e, theprocessor unit 31 will save the profile under that name or mnemonic inthe memory 32 for use in future sessions after the current session hasended.

In order to submit the modified composite profile, the user then clickson the submit button 80 e and the modified profile is submitted to theservice provider in the manner described above.

When the user selects the “news” option from the main menu, then theuser will be given the option of subscribing to the news serviceprovided by the information provider and, if the user chooses tosubscribe, this information will be sent to the service provider 4 overthe GSM network 6.

FIG. 26 shows a diagram for illustrating the sequence of events incommunication between one particular subscriber and the demand engineserver 8 on the one hand and between the demand engine server 8 and theclient site processor CSP1 on the other hand. The arrow labelled “t” inFIG. 26 indicates the direction of increasing time.

Prior to the subscriber establishing communication or connection withthe demand engine server 8, the client site processor CSP2 is sendingpackets 200 of data to the demand engine server which will be extractedby the parser 9 and used to update the data stored in the database 10.Subsequently, as shown in FIG. 26, this particular subscriberestablishes connection with the demand engine server 8 and submits aprofile indicating interest in contracts C1 and C2. This profile may beany of the profiles described above with reference to FIGS. 20 to 25.

The demand engine server takes the received profile data and registersthat profile 8 data in the packet filter 14 so that this particularsubscriber is associated with the nodes of the packet filtercorresponding to the patterns for the contracts C1 and C2 identified bythe registered profile. At this time, the demand engine server 8 willalso initialise the subscriber's session by communicating to thesubscriber over the GSM network the current data for the contracts C1and C2 from the database 10. Once the subscriber's portable computer 30has received and processed this data for display to the user, then theportable computer 30 sends a ready signal back to the demand engineserver 8 indicating that it is ready to receive update data. During thistime, the client site processor CSP1 is continuing to send the stream ofpackets received from the information provider to the demand engineserver 8 over the TCP/IP connection 6 c. Price updates relating to thecontracts C1 and C2 in the subscriber's registered profiles will then beforwarded to the subscriber via the subscriber interface 15. Generally,the processor unit 31 will take a time period Tc (typicallyapproximately 1 second) to process the received data for display to theuser. However, as shown in FIG. 26, the time period Ts between receiptof updated data for contracts in the subscriber's profile may, dependenton the market activity, be considerably shorter than Tc so that thedemand engine server 8 will have newly updated price data to send to thesubscriber before the subscriber indicates that it is ready again toreceive data. Where this is the case, then as described above, the newlyupdated data may be stored in the data structure 23 (FIG. 5). If, asshown in FIG. 26, the subscriber does not indicate to the demand engineserver that it is ready to receive further data until another set ofupdated data for the contracts C1 and C2 has been received by the demandengine server 8, then the intermediate set of update data will bediscarded and only the most recently received updated data will beforwarded to the subscriber. This means that the stream of data to thesubscriber is fragmented and that some updates are omitted. However, ithas the advantage that the subscriber can be sure that the data receivedis the most recent update and that there is no backlog of updates at thedemand engine server 8 awaiting supply to the subscriber. Of course, ifthe processor unit 31 of the portable computer is sufficiently powerfulor there is little activity in relation to a contract, then the timeperiod Tc may be comparable to the time period Ts so that all updatedata is supplied to the subscriber. Similarly, all update data may besupplied to the subscriber if the subscriber's computer has sufficientmemory capacity to store new update data while previously receivedupdate data is being processed for display to the user. Where theprocessor unit 31 is sufficiently powerful or the portable computer hassufficient memory to achieve this, then the protocol may be modified sothat the demand engine server 8 does not await a ready signal from thesubscriber but sends the updated data to the subscriber as and when itis received in accordance with the TCP/IP protocol over the GSM network.

FIGS. 27 to 31 show examples of how received data is displayed on thedisplay 36 to a user for different types of profile. FIGS. 27, 28, 29,30 and 31 show, respectively, a standard futures profile, a standardoptions profile, a regular options profile, a composite futures profileand a FOREX profile. FIG. 32 shows how received data is displayed to auser for an index profile while FIG. 33 shows how received data isdisplayed to a user for a stock profile.

FIG. 34 shows the screen displayed to a user when the news service isselected. As can be seen for FIG. 34, although the service provider 4communicates the entirety of each news item to the portable computer 30,initially only the headlines for each news item are displayed on thedisplay 36. However, the user can elect to see the full text of a newsitem by clicking on the headline for that news item. FIG. 35 shows atypical example of the display of a news item. Each screen will bedisplayed in a separate window and these windows may, as is well knownin the Windows CE art, be displayed separately, tiled or cascaded.

The above description assumes that the signal over the GSM network neverdrops out during a session. If, however, the signal does drop out, thenthe user will be notified in the title bar of the relevant window thatthe signal has been lost and that reconnection is being attempted. Oncethe physical link over the GSM network has been re-established, then theportable computer will automatically resend the subscriber's profiles soas to re-establish transmission of data.

It will be appreciated that the screens described above represent onlyan example and that the user may be provided with different profileselection and display options. Also, although in the above describedembodiments, information received over the GSM network from the serviceprovider 4 is displayed to the user using a standard Windows CEgraphical user interface, other graphical user interfaces may be used.For example, a web graphical user interface such as Microsoft InternetExplorer may be used. In addition, the computer need not necessarily bearranged to operate using a Windows or Windows CE operating system. Forexample, the software may be adapted to run on, for example, the EPOCH32 operating system or the PALMOS operating system. Also, data searchingtechniques other than the ternary tree structure described above may beused, for example so called HASH tables or binary tree structures may beused although these may be less efficient. In addition, the presentinvention is not dependent on the particular information provider andmay be implemented using financial data supplied via differentinformation providers. Also, the financial data need not necessarily besupplied to the service provider via a satellite communications link butcould, for example, be via a dedicated land communications linkespecially if the information provider 2 is located physically close toor at the same location as the service provider 4. In addition, theclient site processors CSP1 and CSP2 may be located remote from thesubscriber information supplying apparatus, provided that acommunications link can be established between the client siteprocessors and the information supplying apparatus. Furthermore,communication protocols other than the TCP/IP protocol may be used, ifdesired.

The present invention may be applied wherein a subscriber wishes orneeds to receive data via a mobile telecommunication network. Thesubscriber's computer may be a desktop computer having only mobiletelecommunications facsilities (that is having no land line connection)on a combined computer and mobile telephone.

Although the above described embodiments relate to the supply of realtime updating financial data, the present invention may be applied tothe supply of any rapidly changing data such as racing information forexample horse racing information, or other betting or similar gamblingproducts.

1. Apparatus for supplying changing information to communication devicesof subscribers during subscriber sessions via a mobiletelecommunications network, the apparatus comprising: a receiver toreceive changing information for each of a plurality of different setsof data; a data base to store received information for each of theplurality of different sets of data; a communicator to communicate witha said subscriber communication device via a mobile telecommunicationsnetwork; a determiner to, when a said subscriber communication deviceestablishes communication via the communicator to start a subscribersession for a subscriber, determining the group of said different setsof data associated with that said subscriber; and a supplier to supply,when a said subscriber communication device establishes communicationvia the communicator to start a subscriber session for a subscriber, tothat subscriber communication device via the mobile telecommunicationsnetwork as initial information the information currently stored in thedata base for the sets of data in which that subscriber is interested tocause that subscriber communication device to present that initialinformation to the subscriber and to subsequently, as changinginformation is received by the receiver during the subscriber session,supply to the subscriber communication device via the mobiletelecommunications network only changes since that initial information,to cause that subscriber communication device to present those changesto the subscriber, the supplier being operable to continue supplyingchanges since that initial information to that subscriber communicationdevice until the subscriber terminates the subscriber session. 2-23.(canceled)
 24. Apparatus for supplying to a subscriber via a mobiletelecommunications network continually changing price information for aplurality of different sets of financial market data, the apparatuscomprising a determiner to determine which of the different sets offinancial market data a subscriber is interested in and a supplier toinitially supply the subscriber via the mobile telecommunicationsnetwork all current information for the set or sets of financial marketdata in which the subscriber is interested and then to supply to thesubscriber via the mobile telecommunications network only updates orchanges in the information for that set or sets of financial market datathat have occurred since the information initially supplied to thesubscriber.
 25. A subscriber apparatus for communicating via a mobiletelecommunications network with information supplying apparatus forsupplying to the subscriber changing information for each of a pluralityof different sets of data, the subscriber apparatus comprising: a userinput interface for enabling a user to input data identifying a group ofsaid sets of data in which the subscriber is interested; a communicatorto communicate to the information supplying apparatus via the mobiletelecommunications network data identifying the group of said sets ofdata in which the subscriber is interested; a requester to request fromthe information supplying apparatus via the mobile telecommunicationsnetwork information for the group of sets of data; a receiver to receivefrom the information supplying apparatus via the mobiletelecommunications network, in response to a request by the requester,initial information comprising the current available data for the groupof sets of data at the time of the request and then to receive, aschanges occur in the changing information for the group of sets of data,change information comprising only the changes to the data since theinitial information; and an advisor to advise a user of the receivedinformation.
 26. Apparatus according to claim 25, wherein the advisorcomprises a display to display the initial information to a user and tochange the displayed information as change information is received. 27.Apparatus according to claim 25, further comprising a store to storesubscriber profile data identifying a group of said sets of data inwhich the subscriber is interested.
 28. Apparatus according to claim 25,further comprising an informer to inform the information supplyingapparatus via the mobile telecommunications network when the receiver isready to receive information.
 29. Apparatus according to claim 25,further comprising a store to store received information.
 30. Apparatusaccording to claim 25, wherein the store is arranged to store receivedinformation while the advisor is advising a user of previously receivedinformation.
 31. A method of supplying to subscribers via a mobiletelecommunications network changing information for each of a pluralityof different sets of data, the method comprising the steps of: receivingchanging information from an information provider; storing datarepresenting the received changing information in a database; storingdata indicating which of the different sets of data a subscriber isinterested in; establishing communication with a subscriber via themobile telecommunications network; when communication is establishedwith the subscriber, supplying the subscriber with information regardingthe data sets in which the subscriber is interested by initiallysupplying to the subscriber over the mobile telecommunications networkinitial information representing the data then stored in the databasefor the data sets in which the subscriber is interested and, after theinitial information has been supplied, as further changing informationis received from the information provider, supplying directly to thesubscriber over the mobile telecommunications network only changes inthe information since the initial information.
 32. A method according toclaim 31, wherein the plurality of different sets of data is a pluralityof different sets of financial market data.
 33. A method according toclaim 31, which comprises storing in the database as said changinginformation changing price data.
 34. A method according to claim 32,which comprises identifying the financial exchange and contract to whichreceived changing price data relates and storing that changing pricedata in a file related to that contract.
 35. A method according to claim31, wherein existing changing information in the database is replaced asnew changing information is received.
 36. A method according to claim31, wherein the subscriber profile storing step comprises associating asubscriber with codes relating to the or each set of data in which thesubscriber is interested.
 37. A method according to claim 31, whereinthe subscriber profile storing step comprises associating differentcharacter strings with sets of data and associating a subscriber with acharacter string relating to a set of data in which the subscriber isinterested.
 38. A method according to claim 37, which comprisesarranging the character strings in at least one ternary tree structure.39. A method according to claim 31, which also comprises communicatingchanging news data to subscribers.
 40. A method according to claim 32,wherein changing information is received by satellite communication fromat least one information provider.
 41. A method of operating a computerhaving mobile telecommunications facilities to enable communication viaa mobile telecommunications network with information supplying apparatusfor supplying to the subscriber changing information for each of aplurality of different sets of data, the method comprising: receivingvia a user input device data identifying a group of said sets of data inwhich the subscriber is interested; communicating the subscriber profiledata to the information supplying apparatus; establishing communicationwith the information supplying apparatus; when communication isestablished with the information supplying apparatus, initiallyreceiving from the information supplying apparatus over the mobiletelecommunications network all information stored in the database forthe group of said sets of data in which the subscriber is interested andthereafter, as further changing information is received, receiving fromthe information supplying apparatus over the mobile telecommunicationsnetwork only changes to the information for that group since theinformation stored in the database was supplied to the subscriber.42-43. (canceled)